Have a 1990 computer controled 350 throttlebody engine the idle is too slow a tends to stumble on take off, sometimes dies when stopped. Some one told me you had to jumper the computer and set the timing (if so where do you jump)?

On my 89 GMC the jumper is on the firewall, passenger side. It is underneath a large plastic cover that has plastic hex nuts securing the cover. Jumper should be marked from the factory.

John

Sounds like a bad or sticking IAC motor.

I think I like carbs better, anyway I found the iac will be taking it out tonight and attempting to clean the gum off with carb cleaner. Thanks

I would check the IAC. But to answer your question I did look it up in our repair manuals

Set timing on a 90 corvette 350 CID
Normal operating temp
Air cleaner on
A/C off
Trans in neutral

Disconnect tan/black wire located in harness near distributor. Do not disconnect 4 wire connector.

Timing spec is 6 deg BTDC
Rpm for timing adjustment should be at 400 in drive, or 450 in neutral for automatic. 450 neutral for manual.

|UPDATED|5/11/2004 11:16:20 AM (AZT)|/UPDATED|

Found the tan/black wire--idle is at 500when it idles

Good. With the wire disconnected, set the timing as you always would have without the computer.

If it's hook up when set, you actually set the timing retarted. The computer was advancing it.
When you are finished, just hook the wire back up and you are all set.

As luck goes I got home last night and found that lightning had taken out the phone and electric. Power company and phone should be restore by 6PM today (corporate promise) will attempt the iac cleaning again tonight.